If we compare the word’s currencies – we know that eventually, all fiat returns to zero. Given game theory, when currencies begin to fail – where do people turn? Generally, they turn to the reserve currency. You will likely see USD in all counties as a backup and in many countries, they much prefer USD to their native currency. For all of its faults – what currency is stronger?
The US can export its inflation everywhere else because other countries require USD to conduct nation to nation transactions. This is nothing new. French President Charles de Gualle complained of this in 1965 before Nixon too the US off the Gold Standard five years later. This is captured in the Youtube video of his speech on the topic.
It would be trivial now, given the knowledge gained in the last eight years, that the world’s best computer scientist would spin off a near-clone of any crypto currency that might be infiltrated, outlawed, breached or whatever dastardly dead you might think up. Creating hardware solutions to break encryption has already been done. So it is likely and probably following game theory that this could and would happen again if possible. But no spy agency works in a vacuum. The NSA has been infiltrated, I’m quite certain that there isn’t a spy agency in the world that is immune to this. People run these agencies. People are human and can be bribed, coerced, embarrassed, killed for their secrets. However, you can’t fool math. Having a number of private keys in excess of all the atoms in the universe is a physical law. Elliptical curve encryption and one-way functions are physical limitations for today’s technology. There are quantum-proof encryption techniques.
Perhaps one day there is a computer so advanced we can’t imagine it yet. But you also cannot discount the human desire for privacy, for fairness, and our ingenuity to overcome whatever barriers are thrown up to limit one’s freedom. I do not discount the human spirit. That was this inventiveness and rebel spirit that created the invention of blockchain and cryptocurrencies, to begin with after the 2008 banking crisis.